SpringBoot——日志及原理

1 import org.slf4j.Logger;
2 import org.slf4j.LoggerFactory;
3 
4 public class HelloWorld {
5   public static void main(String[] args) {
6     Logger logger = LoggerFactory.getLogger(HelloWorld.class);//记录器
7     logger.info("Hello World");
8   }
9 }

1 dependency>
2     groupId>org.springframework.bootgroupId>
3     artifactId>spring‐boot‐starterartifactId>
4 dependency>

1 dependency>
2     groupId>org.springframework.bootgroupId>
3     artifactId>spring‐boot‐starter‐loggingartifactId>
4 dependency>

 1 dependency>
 2     groupId>org.springframeworkgroupId>
 3     artifactId>spring‐coreartifactId>
 4     exclusions>
 5         exclusion>
 6             groupId>commons‐logginggroupId>
 7             artifactId>commons‐loggingartifactId>
 8         exclusion>
 9     exclusions>
10 dependency>

 1 //日志记录器
 2 Logger logger = LoggerFactory.getLogger(getClass());
 3 
 4 @Test
 5 public void contextLoads() {
 6     //日志的级别：优先级tracedebug 7     //可以调整输出的日志级别；日志就只会在这个级别及以后的高级别生效
 8     logger.trace("这是跟踪日志");
 9     logger.debug("这是调试日志");
10     //SpringBoot默认使用的是 info级别的;root级别
11     logger.info("这是自定义");
12     logger.warn("这是警告日志");
13     logger.error("这是错误日志");
14 }

 1 #修改打印级别 == 可以细化到包级别
 2 logging.level.com=trace
 3 #下面path与file都不指定时，日志输出到控制台，两个都指定时，file生效
 4 #指定目录，文件名默认spring.log中，如下是在当前磁盘根路径下创建var文件和里面的log文件。
 5 logging.path=/var/log  
 6 #指定文件名 当前项目下生成springboot.log日志，也可以指定到本地文件中d:/springboot.log等
 7 logging.file=springboot.log
 8 #在控制台日志输入的格式
 9 logging.pattern.console=%d{yyyy‐MM‐dd} [%thread] %‐5level %logger{50} ‐ %msg%n
10 #在文件中日志输出的格式
11 #日志输出格式：
12 #    %d表示日期时间，
13 #    %thread表示线程名，
14 #    %‐5level：级别从左显示5个字符宽度
15 #    %logger{50} 表示logger名字最长50个字符，否则按照句点分割。
16 #    %msg：日志消息，
17 #    %n是换行符
18 logging.pattern.file=%d{yyyy‐MM‐dd} [%thread] %‐5level %logger{50} ‐ %msg%n

 1 
 2 included>
 3     include resource="org/springframework/boot/logging/logback/defaults.xml" />
 4     property name="LOG_FILE" value="${LOG_FILE:-${LOG_PATH:-${LOG_TEMP:-${java.io.tmpdir:-/tmp}}}/spring.log}"/>
 5     include resource="org/springframework/boot/logging/logback/console-appender.xml" />
 6     include resource="org/springframework/boot/logging/logback/file-appender.xml" />
 7         
 8     root level="INFO">
 9         appender-ref ref="CONSOLE" />
10         appender-ref ref="FILE" />
11     root>
12 included>

 1 xml version="1.0" encoding="UTF-8"?>
 2 
 7 configuration scan="false" scanPeriod="60 seconds" debug="false">
 8     
 9     property name="LOG_HOME" value="/app/log" />
10     
11     property name="appName" value="atguigu-springboot">property>
12     
13     appender name="stdout" class="ch.qos.logback.core.ConsoleAppender">
14         
23         layout class="ch.qos.logback.classic.PatternLayout">
24             pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger{50} - %msg%npattern>
25         layout>
26     appender>
27 
28       
29     appender name="appLogAppender" class="ch.qos.logback.core.rolling.RollingFileAppender">
30         
31         file>${LOG_HOME}/${appName}.logfile>
32         
36         rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
37             
41             fileNamePattern>${LOG_HOME}/${appName}-%d{yyyy-MM-dd}-%i.logfileNamePattern>
42             
47             MaxHistory>365MaxHistory>
48             
51             timeBasedFileNamingAndTriggeringPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP">
52                 maxFileSize>100MBmaxFileSize>
53             timeBasedFileNamingAndTriggeringPolicy>
54         rollingPolicy>
55              
56         layout class="ch.qos.logback.classic.PatternLayout">
57             pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} [ %thread ] - [ %-5level ] [ %logger{50} : %line ] - %msg%npattern>
58         layout>
59     appender>
60 
61     
69     
70     logger name="com.atguigu" level="debug" />
71     
72     logger name="org.springframework" level="debug" additivity="false">logger>
73 
74     
78     root level="info">
79         appender-ref ref="stdout" />
80         appender-ref ref="appLogAppender" />
81     root>
82 configuration> 

1 layout class="ch.qos.logback.classic.PatternLayout">
2     
3     springProfile name="dev">
4         pattern>%d{yyyy‐MM‐dd HH:mm:ss.SSS} ‐‐‐‐> [%thread] ‐‐‐> %‐5level%logger{50} ‐ %msg%npattern>
5     springProfile>
6     springProfile name="!dev">
7         pattern>%d{yyyy‐MM‐dd HH:mm:ss.SSS} ==== [%thread] ==== %‐5level%logger{50} ‐ %msg%npattern>
8     springProfile>
9 layout>

 1 dependency>
 2     groupId>org.springframework.bootgroupId>
 3     artifactId>spring-boot-starter-webartifactId>
 4 dependency>
 5 dependency>
 6     groupId>org.springframework.bootgroupId>
 7     artifactId>spring-boot-starterartifactId>
 8     exclusions>
 9         exclusion>
10             groupId>org.springframework.bootgroupId>
11             artifactId>spring-boot-starter-loggingartifactId>
12         exclusion>
13     exclusions>
14 dependency>
15 dependency>
16     groupId>org.springframework.bootgroupId>
17     artifactId>spring-boot-starter-log4j2artifactId>
18 dependency>

 1   
 2  appender name="logFile" class="ch.qos.logback.core.rolling.RollingFileAppender">                   
 3      Prudent>truePrudent> 
 4      rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy"> 
 5          FileNamePattern> applog/%d{yyyy-MM-dd}/%d{yyyy-MM-dd}.log FileNamePattern> 
 6      rollingPolicy> 
 7      layout class="ch.qos.logback.classic.PatternLayout"> 
 8          Pattern> %d{yyyy-MM-dd HH:mm:ss} -%msg%n Pattern> 
 9      layout> 
10  appender>